An illness preferably of an infectious nature seizin more than two persons on board at the same time defines（）.<br>A:disease of crew<br>B:crew illness<br>C:group illness<br>D:mass disease

An illness preferably of an infectious nature seizin more than two persons on board at the same time defines（）.
A:disease of crew
B:crew illness
C:group illness
D:mass disease

出自：海船船员证

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